Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers.

Terahertz wave generation from hyper-Raman lines in two-level quantum systems driven by two-color lasers.
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由双色激光器驱动的两级量子系统中的超拉曼线产生太赫兹波。

DOI:
10.1364/oe.21.021349
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发表时间:
2012-01
期刊:
影响因子:
3.8
通讯作者:
Zhao, Xian-Geng
Zhao, Xian-Geng
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhang, Wei;Guo, Shi-Fang;Duan, Su-Qing;Zhao, Xian-Geng

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基于时空对称性破缺机制,提出了一种利用双色激光场驱动的二能级量子系统中与0次谐波(一种特殊的偶次谐波)相关的超拉曼谱线产生太赫兹波的新方案.通过准能量分析,可以通过改变驱动激光的场幅值来调谐太赫兹波的频率。通过优化激光场的参数,我们能够获得具有可观强度(与典型谐波一样强)的THz范围内的任意频率辐射。鉴于双色激光场产生偶次谐波的实验进展,我们的建议可以在实验上实现。
Based on spatial-temporal symmetry breaking mechanism, we propose a novel scheme for terahertz (THz) wave generation from hyper-Raman lines associated with the 0th harmonic (a particular even harmonic) in a two-level quantum system driven by two-color laser fields. With the help of analysis of quasi-energy, the frequency of THz wave can be tuned by changing the field amplitude of the driving laser. By optimizing the parameters of the laser fields, we are able to obtain arbitrary frequency radiation in the THz regime with appreciable strength (as strong as the typical harmonics). Our proposal can be realized in experiment in view of the recent experimental progress of even-harmonics generation by two-color laser fields.
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